>
>
>Does the copper really need to be this thick? The induction current is not
>very deep, so in theory a piece of 1/16" or thinner sheet should work just
>fine, except for staying cold. I was thinking of using a 1/4" x 12" sq.
>piece for weight and $ considerations.
>
>Tom Bauer
>Wellesley College

The induction current is at least as deep as the magnetic flux
penetrates the copper -- and that's a few inches. Furthermore, the
resistance of the copper is markedly decreased with an increase in
thickness, so you end up with a larger current and bigger effect for
thick pieces. Wolfgang
From MLowry@D115.ORG Fri Sep 26 07:25:55 2003